CRQ dyspnoea | CRQ fatigue | CCQ total | CAT | mMRC | 6MWD | |
D-PPAC | ||||||
Factor 1: amount with Dynaport | 0.36* | 0.18* | −0.20* | −0.23* | −0.42* | 0.55* |
Factor 1: amount with Actigraph | 0.34* | 0.17* | −0.19* | −0.20* | −0.41* | 0.55* |
Factor 2: difficulty | 0.74* | 0.66* | −0.72* | −0.66* | −0.56* | 0.41* |
C-PPAC | ||||||
Factor 1: amount with Dynaport | 0.36* | 0.37* | −0.37* | −0.38* | −0.53* | 0.62* |
Factor 1: amount with Actigraph | 0.35* | 0.36* | −0.34* | −0.37* | −0.55* | 0.65* |
Factor 2: difficulty | 0.86* | 0.73* | −0.85* | −0.82* | −0.70* | 0.49* |
Bold type represents the observed correlations agreed with the expected correlations set by a panel of experts. CRQ: chronic respiratory questionnaire; CCQ: clinical COPD questionnaire; CAT: COPD assessment test; mMRC: modified Medical Research Council dyspnoea scale; 6MWD: 6-min walking distance. *: p<0.05.